protobuf: Check pack/unpack/getsize function types
protobuf: Check pack/unpack/getsize function types

We pass them as generic (*)() pointers into pb_read/pb_write so typechecking is required

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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